export interface LoggerOptions {
    /** Whether to prepend a timestamp to each log message */
    showTimestamp?: boolean;
}
export default class Logger {
    private static instance;
    private showTimestamp;
    private constructor();
    /**
     * Returns the singleton instance of Logger.
     * The options are applied only on the first call.
     * @param options Logger configuration options.
     */
    static getInstance(options?: LoggerOptions): Logger;
    debug(...args: any[]): void;
    info(...args: any[]): void;
    warn(...args: any[]): void;
    error(...args: any[]): void;
    success(...args: any[]): void;
    logErrorAndExit(message: string, exitCode?: number): void;
    private getTimestamp;
    /**
     * Logs a message with a colored level tag.
     * @param level - The log level (e.g. 'debug', 'info', 'warn', 'error').
     * @param args - One or more values to log.
     */
    private log;
}
export declare const logger: Logger;